Sampling 4 pieces of precision-cut wire (to be used in computer assembly) every hour for the past 24 hours has produced the following results:
Hour x R Hour x R Hour x R Hour x R
1 3.35" 0.71" 7 2.95" 0.58" 13 3.11" 0.80" 19 4.51" 1.66"
2 3.10 1.18 8 2.75 1.13 14 2.93 1.31 20 2.79 1.14
3 3.32 1.38 9 2.92 0.66 15 3.02 1.01 21 2.55 1.08
4 3.39 1.21 10 2.85 1.33 16 2.94 0.50 22 2.94 1.58
5 3.07 1.22 11 2.73 1.17 17 2.96 1.38 23 2.94 1.58
6 2.86 0.32 12 3.07 0.40 18 2.64 1.24 24 2.74 0.92
Based on the sampling done, the control limits for 3-sigma ¯x chart are:
Upper Control Limit (UCL¯x) = inches
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Sampling 4 pieces of precision-cut wire (to be used in computer assembly) every hour for the past 24...
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